<template>
  <div class="star" :class="starType">
     <span v-for="itemClass in itemClasses" :class="itemClass" track-by="$index" class="star-item" ></span>   
  </div>
</template>
<script type="text/ecmascript-6">
  const LENGTH = 5;
  const CLS_ON = 'on';
  const CLS_HALF = 'half';
  const CLS_OFF = 'off';
  export default {
    props: {
      size: {
        type: Number
      },
      score: {
        type: Number
      }
    },
    computed: {
      starType() {
        return 'star-' + this.size;
      },
      itemClasses() {
        let result = [];
        let score = Math.floor(this.score * 2) / 2;
        let hasDecimal = score % 1 !== 0;
        let integer = Math.floor(score);
        for (let i = 0; i < integer; i++) {
          result.push(CLS_ON);
        }
        if (hasDecimal) {
          result.push(CLS_HALF);
        }
        while (result.length < LENGTH) {
          result.push(CLS_OFF);
        }
        return result;
      }
    }
  };
</script>
<style lang="stylus" rel="stylesheet/stylus">
  @import "../../common/stylus/mixin.styl"
  .star
    font-size: 0
    .star-item
      display: inline-block
      background-repeat: no-repeat
    &.star-48
     .star-item
       width:20px
       height:20px
       margin-right:22px
       background-size:20px 20px
       &.last-child
         margin-right:0
       &.on
         bg-image('star48_on')
       &.half
         bg-image('star48_half')
       &.off 
          bg-image('star48_off')    
    &.star-36
      .star-item
       width:15px
       height:15px
       margin-right:16px
       background-size:15px 15px
       &.last-child
         margin-right:0
       &.on
         bg-image('star36_on')
       &.half
         bg-image('star36_half')
       &.off 
          bg-image('star36_off')   
    &.star-24 
     .star-item
       width:10px
       height:10px
       margin-right:3px
       background-size:10px 10px
       &.last-child
         margin-right:0
       &.on
         bg-image('star24_on')
       &.half
         bg-image('star24_half')
       &.off 
          bg-image('star24_off')            
</style>